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To push a 25 kg crate up a 2?\" incline, a worker exerts a force of 120 N, parallel to the incline. As the crate slides 3.6 m, how much work is done on the crate by: (a) the worker, (b) the force of gravity, and (c) the normal force due to the incline? A projectile with a mass of 2.4 kg is red from a cliff 125 m high with an imitial velocity of 150 ms, directed 41.0\" above the horizontal. What are (a) the kinetic energy ofthe projectile just after ring and (b) its potential energy? (c) Use conservation of energy to find the speed of the projectile just before it strikes the ground